Skeleton-crown holder.



'E. F. GREER.

SKELETON GROWN HOLDER.

APPLICATION FILED SEPT. 22, 1913.

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ERNEST F. GREEK, 0F IDABEL, OKLAHOMA.

SKELETON-CROWN HOLDER.

Specification of Letters Patent.

Patented May 26, 1914.

Application filed September 22, 1913 Serial No. 791,140.

T 0 all whom it may concern Be it known that I, ERNEST F. Guzman, a citizen of the United States, residing at Idabel, in the county of McCurtain and State of Oklahoma, have invented certain new and useful Improvements in Skeleton- Crown Holders; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to dentistry, and more especially to the tools employed therein; and the object of the same is to produce an improved device for holding skeleton crowns in such a way as to leave practically all of the post projecting from the holder so that it can be grasped by a pair of pliers and bent to the desired angle without bending or injuring the shoulders, pins, or backing of the skeleton crown. This object is carried out by constructing the holder in the manner hereinafter more fully described and claimed, and as shown in the drawings wherein Figure 1 is a plan view; Fig. 2 is a central longitudinal section; Fig. 3 is a perspective detail of the movable jaw; and Fig. 4 is a cross section on the line l& of Fig. 1.

This implement comprises two jaws, two set screws, and a handle, and as one jaw is carried by the handle I will refer to this as the fixed jaw and the other as the movable or detachable jaw. The fixed jaw 1 is substantially L-shaped in plan View, and from its inner end which is the foot of the L projects a stem 2 which enters the handle 3. Extending from the shank of the L at right angles to the stem 2 is a pin 1, and parallel with said pin but nearer to the handle is a hole 5 into which and through which passes loosely a set screw 6 for a purpose yet to appear. Yet nearer to the handle the inner face of this portion of the fixed jaw is provided with a recess 7 which, when complemented by a similar recess in the movable jaw yet to be described, produces a cavity for the shoulders, pin and backing of the skeleton crown. The lower end of this recess is closed by a thin wall 8 which, with the companion wall in the movable jaw yet to be described, constitutes the bottom of said cavity; and at its forward side this wall is thickened so as to produce a shoulder as at 9 whose function will appear below. Through the wall just adjacent said shoulder is cut a notch 10. Obliquely through the inner end of this fixed jaw passes a threaded opening to receive a set screw 11 whose axis is directed toward the center of this notch.

The movable jaw, best seen in Fig. 3, is a block-shaped member preferably of the same material as that employed for the fixed jaw, and of a size to fill out the space at the forward end of said L-shaped member so that the head of this instrument will be substantially rectangular in plan view as seen in Fig. 1. At its front end this member has a, transverse hole 1 1 in which the pin l fits slidably, and a threaded hole 15 for the engagement of the threads at the tip of the set screw 6. In its inner face in rear of these holes is formed a recess 17 complementing the recess 7 above described, and this recess is closed at its lower end by a wall 18 shouldered as at 19 and having a notch 20 complementing the notch 10- in the wall 8 and thereby producing a hole or opening through the bottom of the cavity through which the post P of the skeleton crown projects when its shoulders S rest on said wall as best seen in Fig. 2. At this time the set screw 11 is passed down through the oblique hole, and its tip rests upon said shoulders so that the parts of the skeleton crown are very closely held in position. The adjustment of the set screw 6 and therefore of the movable jaw is obviously for the purpose of setting said jaw nearer to or farther from the fixed jaw, so that the instrument will be accommodated to skeleton crowns of ariable sizes. It will be observed that almost all of the pin P projects below the instrument and the operator by holding the handle 3 in his left hand and reversing the tool or instrument can bring the post in position to be grasped by a pair of pliers held in his other hand or treated in any suit able manner.

What is claimed as new is:

V 1. A skeleton crown holder composed of two members provided with registering recesses in their contiguous faces to produce a cavity when they are drawn together, means for so drawing them together, thin walls at the lower ends of said recesses provided with notches adapted to register and produce a hole, and a set screw passing obliquely through one member and directed toward said hole, for the purpose set forth.

2. A skeleton crown holder composed of two members provided with registering recesses in their contiguous faces to produce a cavity when they are drawn together, means for so drawing them together, thin walls at the lower ends of said recesses provided with notches adapted to register and produce a hole, the walls being thickened forward of said hole to produce a shoulder and one member having a threaded hole di rected obliquely toward the hole in the bottom of said cavity, and a set screw adjustably mounted in said threaded hole.

3. A holder for skeleton crowns consisting of two members having in their meeting faces registering upright recesses with bottom walls provided with registering notches, a set screw passing obliquely through one member and directed toward said registering notches, one of said members having two holes through it at right angles to the axis of said recesses, a pin in the opposite member slidably mounted in one of said holes, and a set screw passing loosely through said opposite member and adjustably engaging the other of said holes, for the purpose set forth.

4. The herein described skeleton crown holder consisting of a fixed jaw of substantially L-shape having a handle projecting from its foot and a cavity in the inner face of its shank with a thin wall across the lower end of the cavity and a notch in said wall, a block-shaped movable aw of a size to fill out the space within said L-shaped jaw, the movable jaw having in its inner face a cavity and a thin wall registering with those in the fixed aw a set screw oassin throu h one 7 C! b member and threaded into the other for drawing the members together, and another set screw passing obliquely through the foot of the L-shaped member toward said thin wall.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

ERNEST F. GREEK.

Witnesses H. J. BROWN, G. H. FAwKs.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

